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/*
   History:
    Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user 
     process control of SCSI devices.
    Development Sponsored by Killy Corp. NY NY
*/
 
#ifndef _SCSI_GENERIC_H
#define _SCSI_GENERIC_H
 
/* 
 An SG device is accessed by writing "packets" to it, the replies
 are then read using the read call. The same header is used for 
 reply, just ignore reply_len field.
*/
 
struct sg_header
 {
  int pack_len;    /* length of incoming packet <4096 (including header) */
  int reply_len;   /* maximum length <4096 of expected reply */
  int pack_id;     /* id number of packet */
  int result;      /* 0==ok, otherwise refer to errno codes */
  unsigned int twelve_byte:1; /* Force 12 byte command length for group 6 & 7 commands  */
  unsigned int other_flags:31;			/* for future use */
  unsigned char sense_buffer[16]; /* used only by reads */
  /* command follows then data for command */
 };
 
/* ioctl's */
#define SG_SET_TIMEOUT 0x2201  /* set timeout *(int *)arg==timeout */
#define SG_GET_TIMEOUT 0x2202  /* get timeout return timeout */
 
#define SG_DEFAULT_TIMEOUT (60*HZ) /* 1 minute timeout */
#define SG_DEFAULT_RETRIES 1
 
#define SG_MAX_QUEUE 4 /* maximum outstanding request, arbitrary, may be
			  changed if sufficient DMA buffer room available */
 
#define SG_BIG_BUFF 32768
 
#endif